/*!
  * vue-router v3.0.2
  * (c) 2018 Evan You
  * @license MIT
  */
 'use strict';

 /*  */
 
 function assert (condition, message) {
   if (!condition) {
     throw new Error(("[vue-router] " + message))
   }
 }
 
 function warn (condition, message) {
   if (process.env.NODE_ENV !== 'production' && !condition) {
     typeof console !== 'undefined' && console.warn(("[vue-router] " + message));
   }
 }
 
 function isError (err) {
   return Object.prototype.toString.call(err).indexOf('Error') > -1
 }
 
 function extend (a, b) {
   for (var key in b) {
     a[key] = b[key];
   }
   return a
 }
 
 var View = {
   name: 'RouterView',
   functional: true,
   props: {
     name: {
       type: String,
       default: 'default'
     }
   },
   render: function render (_, ref) {
     var props = ref.props;
     var children = ref.children;
     var parent = ref.parent;
     var data = ref.data;
 
     // used by devtools to display a router-view badge
     data.routerView = true;
 
     // directly use parent context's createElement() function
     // so that components rendered by router-view can resolve named slots
     var h = parent.$createElement;
     var name = props.name;
     var route = parent.$route;
     var cache = parent._routerViewCache || (parent._routerViewCache = {});
 
     // determine current view depth, also check to see if the tree
     // has been toggled inactive but kept-alive.
     var depth = 0;
     var inactive = false;
     while (parent && parent._routerRoot !== parent) {
       if (parent.$vnode && parent.$vnode.data.routerView) {
         depth++;
       }
       if (parent._inactive) {
         inactive = true;
       }
       parent = parent.$parent;
     }
     data.routerViewDepth = depth;
 
     // render previous view if the tree is inactive and kept-alive
     if (inactive) {
       return h(cache[name], data, children)
     }
 
     var matched = route.matched[depth];
     // render empty node if no matched route
     if (!matched) {
       cache[name] = null;
       return h()
     }
 
     var component = cache[name] = matched.components[name];
 
     // attach instance registration hook
     // this will be called in the instance's injected lifecycle hooks
     data.registerRouteInstance = function (vm, val) {
       // val could be undefined for unregistration
       var current = matched.instances[name];
       if (
         (val && current !== vm) ||
         (!val && current === vm)
       ) {
         matched.instances[name] = val;
       }
     }
 
     // also register instance in prepatch hook
     // in case the same component instance is reused across different routes
     ;(data.hook || (data.hook = {})).prepatch = function (_, vnode) {
       matched.instances[name] = vnode.componentInstance;
     };
 
     // resolve props
     var propsToPass = data.props = resolveProps(route, matched.props && matched.props[name]);
     if (propsToPass) {
       // clone to prevent mutation
       propsToPass = data.props = extend({}, propsToPass);
       // pass non-declared props as attrs
       var attrs = data.attrs = data.attrs || {};
       for (var key in propsToPass) {
         if (!component.props || !(key in component.props)) {
           attrs[key] = propsToPass[key];
           delete propsToPass[key];
         }
       }
     }
 
     return h(component, data, children)
   }
 }
 
 function resolveProps (route, config) {
   switch (typeof config) {
     case 'undefined':
       return
     case 'object':
       return config
     case 'function':
       return config(route)
     case 'boolean':
       return config ? route.params : undefined
     default:
       if (process.env.NODE_ENV !== 'production') {
         warn(
           false,
           "props in \"" + (route.path) + "\" is a " + (typeof config) + ", " +
           "expecting an object, function or boolean."
         );
       }
   }
 }
 
 /*  */
 
 var encodeReserveRE = /[!'()*]/g;
 var encodeReserveReplacer = function (c) { return '%' + c.charCodeAt(0).toString(16); };
 var commaRE = /%2C/g;
 
 // fixed encodeURIComponent which is more conformant to RFC3986:
 // - escapes [!'()*]
 // - preserve commas
 var encode = function (str) { return encodeURIComponent(str)
   .replace(encodeReserveRE, encodeReserveReplacer)
   .replace(commaRE, ','); };
 
 var decode = decodeURIComponent;
 
 function resolveQuery (
   query,
   extraQuery,
   _parseQuery
 ) {
   if ( extraQuery === void 0 ) extraQuery = {};
 
   var parse = _parseQuery || parseQuery;
   var parsedQuery;
   try {
     parsedQuery = parse(query || '');
   } catch (e) {
     process.env.NODE_ENV !== 'production' && warn(false, e.message);
     parsedQuery = {};
   }
   for (var key in extraQuery) {
     parsedQuery[key] = extraQuery[key];
   }
   return parsedQuery
 }
 
 function parseQuery (query) {
   var res = {};
 
   query = query.trim().replace(/^(\?|#|&)/, '');
 
   if (!query) {
     return res
   }
 
   query.split('&').forEach(function (param) {
     var parts = param.replace(/\+/g, ' ').split('=');
     var key = decode(parts.shift());
     var val = parts.length > 0
       ? decode(parts.join('='))
       : null;
 
     if (res[key] === undefined) {
       res[key] = val;
     } else if (Array.isArray(res[key])) {
       res[key].push(val);
     } else {
       res[key] = [res[key], val];
     }
   });
 
   return res
 }
 
 function stringifyQuery (obj) {
   var res = obj ? Object.keys(obj).map(function (key) {
     var val = obj[key];
 
     if (val === undefined) {
       return ''
     }
 
     if (val === null) {
       return encode(key)
     }
 
     if (Array.isArray(val)) {
       var result = [];
       val.forEach(function (val2) {
         if (val2 === undefined) {
           return
         }
         if (val2 === null) {
           result.push(encode(key));
         } else {
           result.push(encode(key) + '=' + encode(val2));
         }
       });
       return result.join('&')
     }
 
     return encode(key) + '=' + encode(val)
   }).filter(function (x) { return x.length > 0; }).join('&') : null;
   return res ? ("?" + res) : ''
 }
 
 /*  */
 
 var trailingSlashRE = /\/?$/;
 
 function createRoute (
   record,
   location,
   redirectedFrom,
   router
 ) {
   var stringifyQuery$$1 = router && router.options.stringifyQuery;
 
   var query = location.query || {};
   try {
     query = clone(query);
   } catch (e) {}
 
   var route = {
     name: location.name || (record && record.name),
     meta: (record && record.meta) || {},
     path: location.path || '/',
     hash: location.hash || '',
     query: query,
     params: location.params || {},
     fullPath: getFullPath(location, stringifyQuery$$1),
     matched: record ? formatMatch(record) : []
   };
   if (redirectedFrom) {
     route.redirectedFrom = getFullPath(redirectedFrom, stringifyQuery$$1);
   }
   return Object.freeze(route)
 }
 
 function clone (value) {
   if (Array.isArray(value)) {
     return value.map(clone)
   } else if (value && typeof value === 'object') {
     var res = {};
     for (var key in value) {
       res[key] = clone(value[key]);
     }
     return res
   } else {
     return value
   }
 }
 
 // the starting route that represents the initial state
 var START = createRoute(null, {
   path: '/'
 });
 
 function formatMatch (record) {
   var res = [];
   while (record) {
     res.unshift(record);
     record = record.parent;
   }
   return res
 }
 
 function getFullPath (
   ref,
   _stringifyQuery
 ) {
   var path = ref.path;
   var query = ref.query; if ( query === void 0 ) query = {};
   var hash = ref.hash; if ( hash === void 0 ) hash = '';
 
   var stringify = _stringifyQuery || stringifyQuery;
   return (path || '/') + stringify(query) + hash
 }
 
 function isSameRoute (a, b) {
   if (b === START) {
     return a === b
   } else if (!b) {
     return false
   } else if (a.path && b.path) {
     return (
       a.path.replace(trailingSlashRE, '') === b.path.replace(trailingSlashRE, '') &&
       a.hash === b.hash &&
       isObjectEqual(a.query, b.query)
     )
   } else if (a.name && b.name) {
     return (
       a.name === b.name &&
       a.hash === b.hash &&
       isObjectEqual(a.query, b.query) &&
       isObjectEqual(a.params, b.params)
     )
   } else {
     return false
   }
 }
 
 function isObjectEqual (a, b) {
   if ( a === void 0 ) a = {};
   if ( b === void 0 ) b = {};
 
   // handle null value #1566
   if (!a || !b) { return a === b }
   var aKeys = Object.keys(a);
   var bKeys = Object.keys(b);
   if (aKeys.length !== bKeys.length) {
     return false
   }
   return aKeys.every(function (key) {
     var aVal = a[key];
     var bVal = b[key];
     // check nested equality
     if (typeof aVal === 'object' && typeof bVal === 'object') {
       return isObjectEqual(aVal, bVal)
     }
     return String(aVal) === String(bVal)
   })
 }
 
 function isIncludedRoute (current, target) {
   return (
     current.path.replace(trailingSlashRE, '/').indexOf(
       target.path.replace(trailingSlashRE, '/')
     ) === 0 &&
     (!target.hash || current.hash === target.hash) &&
     queryIncludes(current.query, target.query)
   )
 }
 
 function queryIncludes (current, target) {
   for (var key in target) {
     if (!(key in current)) {
       return false
     }
   }
   return true
 }
 
 /*  */
 
 // work around weird flow bug
 var toTypes = [String, Object];
 var eventTypes = [String, Array];
 
 var Link = {
   name: 'RouterLink',
   props: {
     to: {
       type: toTypes,
       required: true
     },
     tag: {
       type: String,
       default: 'a'
     },
     exact: Boolean,
     append: Boolean,
     replace: Boolean,
     activeClass: String,
     exactActiveClass: String,
     event: {
       type: eventTypes,
       default: 'click'
     }
   },
   render: function render (h) {
     var this$1 = this;
 
     var router = this.$router;
     var current = this.$route;
     var ref = router.resolve(this.to, current, this.append);
     var location = ref.location;
     var route = ref.route;
     var href = ref.href;
 
     var classes = {};
     var globalActiveClass = router.options.linkActiveClass;
     var globalExactActiveClass = router.options.linkExactActiveClass;
     // Support global empty active class
     var activeClassFallback = globalActiveClass == null
       ? 'router-link-active'
       : globalActiveClass;
     var exactActiveClassFallback = globalExactActiveClass == null
       ? 'router-link-exact-active'
       : globalExactActiveClass;
     var activeClass = this.activeClass == null
       ? activeClassFallback
       : this.activeClass;
     var exactActiveClass = this.exactActiveClass == null
       ? exactActiveClassFallback
       : this.exactActiveClass;
     var compareTarget = location.path
       ? createRoute(null, location, null, router)
       : route;
 
     classes[exactActiveClass] = isSameRoute(current, compareTarget);
     classes[activeClass] = this.exact
       ? classes[exactActiveClass]
       : isIncludedRoute(current, compareTarget);
 
     var handler = function (e) {
       if (guardEvent(e)) {
         if (this$1.replace) {
           router.replace(location);
         } else {
           router.push(location);
         }
       }
     };
 
     var on = { click: guardEvent };
     if (Array.isArray(this.event)) {
       this.event.forEach(function (e) { on[e] = handler; });
     } else {
       on[this.event] = handler;
     }
 
     var data = {
       class: classes
     };
 
     if (this.tag === 'a') {
       data.on = on;
       data.attrs = { href: href };
     } else {
       // find the first <a> child and apply listener and href
       var a = findAnchor(this.$slots.default);
       if (a) {
         // in case the <a> is a static node
         a.isStatic = false;
         var aData = a.data = extend({}, a.data);
         aData.on = on;
         var aAttrs = a.data.attrs = extend({}, a.data.attrs);
         aAttrs.href = href;
       } else {
         // doesn't have <a> child, apply listener to self
         data.on = on;
       }
     }
 
     return h(this.tag, data, this.$slots.default)
   }
 }
 
 function guardEvent (e) {
   // don't redirect with control keys
   if (e.metaKey || e.altKey || e.ctrlKey || e.shiftKey) { return }
   // don't redirect when preventDefault called
   if (e.defaultPrevented) { return }
   // don't redirect on right click
   if (e.button !== undefined && e.button !== 0) { return }
   // don't redirect if `target="_blank"`
   if (e.currentTarget && e.currentTarget.getAttribute) {
     var target = e.currentTarget.getAttribute('target');
     if (/\b_blank\b/i.test(target)) { return }
   }
   // this may be a Weex event which doesn't have this method
   if (e.preventDefault) {
     e.preventDefault();
   }
   return true
 }
 
 function findAnchor (children) {
   if (children) {
     var child;
     for (var i = 0; i < children.length; i++) {
       child = children[i];
       if (child.tag === 'a') {
         return child
       }
       if (child.children && (child = findAnchor(child.children))) {
         return child
       }
     }
   }
 }
 
 var _Vue;
 
 function install (Vue) {
   if (install.installed && _Vue === Vue) { return }
   install.installed = true;
 
   _Vue = Vue;
 
   var isDef = function (v) { return v !== undefined; };
 
   var registerInstance = function (vm, callVal) {
     var i = vm.$options._parentVnode;
     if (isDef(i) && isDef(i = i.data) && isDef(i = i.registerRouteInstance)) {
       i(vm, callVal);
     }
   };
 
   Vue.mixin({
     beforeCreate: function beforeCreate () {
       if (isDef(this.$options.router)) {
         this._routerRoot = this;
         this._router = this.$options.router;
         this._router.init(this);
         Vue.util.defineReactive(this, '_route', this._router.history.current);
       } else {
         this._routerRoot = (this.$parent && this.$parent._routerRoot) || this;
       }
       registerInstance(this, this);
     },
     destroyed: function destroyed () {
       registerInstance(this);
     }
   });
 
   Object.defineProperty(Vue.prototype, '$router', {
     get: function get () { return this._routerRoot._router }
   });
 
   Object.defineProperty(Vue.prototype, '$route', {
     get: function get () { return this._routerRoot._route }
   });
 
   Vue.component('RouterView', View);
   Vue.component('RouterLink', Link);
 
   var strats = Vue.config.optionMergeStrategies;
   // use the same hook merging strategy for route hooks
   strats.beforeRouteEnter = strats.beforeRouteLeave = strats.beforeRouteUpdate = strats.created;
 }
 
 /*  */
 
 var inBrowser = typeof window !== 'undefined';
 
 /*  */
 
 function resolvePath (
   relative,
   base,
   append
 ) {
   var firstChar = relative.charAt(0);
   if (firstChar === '/') {
     return relative
   }
 
   if (firstChar === '?' || firstChar === '#') {
     return base + relative
   }
 
   var stack = base.split('/');
 
   // remove trailing segment if:
   // - not appending
   // - appending to trailing slash (last segment is empty)
   if (!append || !stack[stack.length - 1]) {
     stack.pop();
   }
 
   // resolve relative path
   var segments = relative.replace(/^\//, '').split('/');
   for (var i = 0; i < segments.length; i++) {
     var segment = segments[i];
     if (segment === '..') {
       stack.pop();
     } else if (segment !== '.') {
       stack.push(segment);
     }
   }
 
   // ensure leading slash
   if (stack[0] !== '') {
     stack.unshift('');
   }
 
   return stack.join('/')
 }
 
 function parsePath (path) {
   var hash = '';
   var query = '';
 
   var hashIndex = path.indexOf('#');
   if (hashIndex >= 0) {
     hash = path.slice(hashIndex);
     path = path.slice(0, hashIndex);
   }
 
   var queryIndex = path.indexOf('?');
   if (queryIndex >= 0) {
     query = path.slice(queryIndex + 1);
     path = path.slice(0, queryIndex);
   }
 
   return {
     path: path,
     query: query,
     hash: hash
   }
 }
 
 function cleanPath (path) {
   return path.replace(/\/\//g, '/')
 }
 
 var isarray = Array.isArray || function (arr) {
   return Object.prototype.toString.call(arr) == '[object Array]';
 };
 
 /**
  * Expose `pathToRegexp`.
  */
 var pathToRegexp_1 = pathToRegexp;
 var parse_1 = parse;
 var compile_1 = compile;
 var tokensToFunction_1 = tokensToFunction;
 var tokensToRegExp_1 = tokensToRegExp;
 
 /**
  * The main path matching regexp utility.
  *
  * @type {RegExp}
  */
 var PATH_REGEXP = new RegExp([
   // Match escaped characters that would otherwise appear in future matches.
   // This allows the user to escape special characters that won't transform.
   '(\\\\.)',
   // Match Express-style parameters and un-named parameters with a prefix
   // and optional suffixes. Matches appear as:
   //
   // "/:test(\\d+)?" => ["/", "test", "\d+", undefined, "?", undefined]
   // "/route(\\d+)"  => [undefined, undefined, undefined, "\d+", undefined, undefined]
   // "/*"            => ["/", undefined, undefined, undefined, undefined, "*"]
   '([\\/.])?(?:(?:\\:(\\w+)(?:\\(((?:\\\\.|[^\\\\()])+)\\))?|\\(((?:\\\\.|[^\\\\()])+)\\))([+*?])?|(\\*))'
 ].join('|'), 'g');
 
 /**
  * Parse a string for the raw tokens.
  *
  * @param  {string}  str
  * @param  {Object=} options
  * @return {!Array}
  */
 function parse (str, options) {
   var tokens = [];
   var key = 0;
   var index = 0;
   var path = '';
   var defaultDelimiter = options && options.delimiter || '/';
   var res;
 
   while ((res = PATH_REGEXP.exec(str)) != null) {
     var m = res[0];
     var escaped = res[1];
     var offset = res.index;
     path += str.slice(index, offset);
     index = offset + m.length;
 
     // Ignore already escaped sequences.
     if (escaped) {
       path += escaped[1];
       continue
     }
 
     var next = str[index];
     var prefix = res[2];
     var name = res[3];
     var capture = res[4];
     var group = res[5];
     var modifier = res[6];
     var asterisk = res[7];
 
     // Push the current path onto the tokens.
     if (path) {
       tokens.push(path);
       path = '';
     }
 
     var partial = prefix != null && next != null && next !== prefix;
     var repeat = modifier === '+' || modifier === '*';
     var optional = modifier === '?' || modifier === '*';
     var delimiter = res[2] || defaultDelimiter;
     var pattern = capture || group;
 
     tokens.push({
       name: name || key++,
       prefix: prefix || '',
       delimiter: delimiter,
       optional: optional,
       repeat: repeat,
       partial: partial,
       asterisk: !!asterisk,
       pattern: pattern ? escapeGroup(pattern) : (asterisk ? '.*' : '[^' + escapeString(delimiter) + ']+?')
     });
   }
 
   // Match any characters still remaining.
   if (index < str.length) {
     path += str.substr(index);
   }
 
   // If the path exists, push it onto the end.
   if (path) {
     tokens.push(path);
   }
 
   return tokens
 }
 
 /**
  * Compile a string to a template function for the path.
  *
  * @param  {string}             str
  * @param  {Object=}            options
  * @return {!function(Object=, Object=)}
  */
 function compile (str, options) {
   return tokensToFunction(parse(str, options))
 }
 
 /**
  * Prettier encoding of URI path segments.
  *
  * @param  {string}
  * @return {string}
  */
 function encodeURIComponentPretty (str) {
   return encodeURI(str).replace(/[\/?#]/g, function (c) {
     return '%' + c.charCodeAt(0).toString(16).toUpperCase()
   })
 }
 
 /**
  * Encode the asterisk parameter. Similar to `pretty`, but allows slashes.
  *
  * @param  {string}
  * @return {string}
  */
 function encodeAsterisk (str) {
   return encodeURI(str).replace(/[?#]/g, function (c) {
     return '%' + c.charCodeAt(0).toString(16).toUpperCase()
   })
 }
 
 /**
  * Expose a method for transforming tokens into the path function.
  */
 function tokensToFunction (tokens) {
   // Compile all the tokens into regexps.
   var matches = new Array(tokens.length);
 
   // Compile all the patterns before compilation.
   for (var i = 0; i < tokens.length; i++) {
     if (typeof tokens[i] === 'object') {
       matches[i] = new RegExp('^(?:' + tokens[i].pattern + ')$');
     }
   }
 
   return function (obj, opts) {
     var path = '';
     var data = obj || {};
     var options = opts || {};
     var encode = options.pretty ? encodeURIComponentPretty : encodeURIComponent;
 
     for (var i = 0; i < tokens.length; i++) {
       var token = tokens[i];
 
       if (typeof token === 'string') {
         path += token;
 
         continue
       }
 
       var value = data[token.name];
       var segment;
 
       if (value == null) {
         if (token.optional) {
           // Prepend partial segment prefixes.
           if (token.partial) {
             path += token.prefix;
           }
 
           continue
         } else {
           throw new TypeError('Expected "' + token.name + '" to be defined')
         }
       }
 
       if (isarray(value)) {
         if (!token.repeat) {
           throw new TypeError('Expected "' + token.name + '" to not repeat, but received `' + JSON.stringify(value) + '`')
         }
 
         if (value.length === 0) {
           if (token.optional) {
             continue
           } else {
             throw new TypeError('Expected "' + token.name + '" to not be empty')
           }
         }
 
         for (var j = 0; j < value.length; j++) {
           segment = encode(value[j]);
 
           if (!matches[i].test(segment)) {
             throw new TypeError('Expected all "' + token.name + '" to match "' + token.pattern + '", but received `' + JSON.stringify(segment) + '`')
           }
 
           path += (j === 0 ? token.prefix : token.delimiter) + segment;
         }
 
         continue
       }
 
       segment = token.asterisk ? encodeAsterisk(value) : encode(value);
 
       if (!matches[i].test(segment)) {
         throw new TypeError('Expected "' + token.name + '" to match "' + token.pattern + '", but received "' + segment + '"')
       }
 
       path += token.prefix + segment;
     }
 
     return path
   }
 }
 
 /**
  * Escape a regular expression string.
  *
  * @param  {string} str
  * @return {string}
  */
 function escapeString (str) {
   return str.replace(/([.+*?=^!:${}()[\]|\/\\])/g, '\\$1')
 }
 
 /**
  * Escape the capturing group by escaping special characters and meaning.
  *
  * @param  {string} group
  * @return {string}
  */
 function escapeGroup (group) {
   return group.replace(/([=!:$\/()])/g, '\\$1')
 }
 
 /**
  * Attach the keys as a property of the regexp.
  *
  * @param  {!RegExp} re
  * @param  {Array}   keys
  * @return {!RegExp}
  */
 function attachKeys (re, keys) {
   re.keys = keys;
   return re
 }
 
 /**
  * Get the flags for a regexp from the options.
  *
  * @param  {Object} options
  * @return {string}
  */
 function flags (options) {
   return options.sensitive ? '' : 'i'
 }
 
 /**
  * Pull out keys from a regexp.
  *
  * @param  {!RegExp} path
  * @param  {!Array}  keys
  * @return {!RegExp}
  */
 function regexpToRegexp (path, keys) {
   // Use a negative lookahead to match only capturing groups.
   var groups = path.source.match(/\((?!\?)/g);
 
   if (groups) {
     for (var i = 0; i < groups.length; i++) {
       keys.push({
         name: i,
         prefix: null,
         delimiter: null,
         optional: false,
         repeat: false,
         partial: false,
         asterisk: false,
         pattern: null
       });
     }
   }
 
   return attachKeys(path, keys)
 }
 
 /**
  * Transform an array into a regexp.
  *
  * @param  {!Array}  path
  * @param  {Array}   keys
  * @param  {!Object} options
  * @return {!RegExp}
  */
 function arrayToRegexp (path, keys, options) {
   var parts = [];
 
   for (var i = 0; i < path.length; i++) {
     parts.push(pathToRegexp(path[i], keys, options).source);
   }
 
   var regexp = new RegExp('(?:' + parts.join('|') + ')', flags(options));
 
   return attachKeys(regexp, keys)
 }
 
 /**
  * Create a path regexp from string input.
  *
  * @param  {string}  path
  * @param  {!Array}  keys
  * @param  {!Object} options
  * @return {!RegExp}
  */
 function stringToRegexp (path, keys, options) {
   return tokensToRegExp(parse(path, options), keys, options)
 }
 
 /**
  * Expose a function for taking tokens and returning a RegExp.
  *
  * @param  {!Array}          tokens
  * @param  {(Array|Object)=} keys
  * @param  {Object=}         options
  * @return {!RegExp}
  */
 function tokensToRegExp (tokens, keys, options) {
   if (!isarray(keys)) {
     options = /** @type {!Object} */ (keys || options);
     keys = [];
   }
 
   options = options || {};
 
   var strict = options.strict;
   var end = options.end !== false;
   var route = '';
 
   // Iterate over the tokens and create our regexp string.
   for (var i = 0; i < tokens.length; i++) {
     var token = tokens[i];
 
     if (typeof token === 'string') {
       route += escapeString(token);
     } else {
       var prefix = escapeString(token.prefix);
       var capture = '(?:' + token.pattern + ')';
 
       keys.push(token);
 
       if (token.repeat) {
         capture += '(?:' + prefix + capture + ')*';
       }
 
       if (token.optional) {
         if (!token.partial) {
           capture = '(?:' + prefix + '(' + capture + '))?';
         } else {
           capture = prefix + '(' + capture + ')?';
         }
       } else {
         capture = prefix + '(' + capture + ')';
       }
 
       route += capture;
     }
   }
 
   var delimiter = escapeString(options.delimiter || '/');
   var endsWithDelimiter = route.slice(-delimiter.length) === delimiter;
 
   // In non-strict mode we allow a slash at the end of match. If the path to
   // match already ends with a slash, we remove it for consistency. The slash
   // is valid at the end of a path match, not in the middle. This is important
   // in non-ending mode, where "/test/" shouldn't match "/test//route".
   if (!strict) {
     route = (endsWithDelimiter ? route.slice(0, -delimiter.length) : route) + '(?:' + delimiter + '(?=$))?';
   }
 
   if (end) {
     route += '$';
   } else {
     // In non-ending mode, we need the capturing groups to match as much as
     // possible by using a positive lookahead to the end or next path segment.
     route += strict && endsWithDelimiter ? '' : '(?=' + delimiter + '|$)';
   }
 
   return attachKeys(new RegExp('^' + route, flags(options)), keys)
 }
 
 /**
  * Normalize the given path string, returning a regular expression.
  *
  * An empty array can be passed in for the keys, which will hold the
  * placeholder key descriptions. For example, using `/user/:id`, `keys` will
  * contain `[{ name: 'id', delimiter: '/', optional: false, repeat: false }]`.
  *
  * @param  {(string|RegExp|Array)} path
  * @param  {(Array|Object)=}       keys
  * @param  {Object=}               options
  * @return {!RegExp}
  */
 function pathToRegexp (path, keys, options) {
   if (!isarray(keys)) {
     options = /** @type {!Object} */ (keys || options);
     keys = [];
   }
 
   options = options || {};
 
   if (path instanceof RegExp) {
     return regexpToRegexp(path, /** @type {!Array} */ (keys))
   }
 
   if (isarray(path)) {
     return arrayToRegexp(/** @type {!Array} */ (path), /** @type {!Array} */ (keys), options)
   }
 
   return stringToRegexp(/** @type {string} */ (path), /** @type {!Array} */ (keys), options)
 }
 pathToRegexp_1.parse = parse_1;
 pathToRegexp_1.compile = compile_1;
 pathToRegexp_1.tokensToFunction = tokensToFunction_1;
 pathToRegexp_1.tokensToRegExp = tokensToRegExp_1;
 
 /*  */
 
 // $flow-disable-line
 var regexpCompileCache = Object.create(null);
 
 function fillParams (
   path,
   params,
   routeMsg
 ) {
   try {
     var filler =
       regexpCompileCache[path] ||
       (regexpCompileCache[path] = pathToRegexp_1.compile(path));
     return filler(params || {}, { pretty: true })
   } catch (e) {
     if (process.env.NODE_ENV !== 'production') {
       warn(false, ("missing param for " + routeMsg + ": " + (e.message)));
     }
     return ''
   }
 }
 
 /*  */
 
 function createRouteMap (
   routes,
   oldPathList,
   oldPathMap,
   oldNameMap
 ) {
   // the path list is used to control path matching priority
   var pathList = oldPathList || [];
   // $flow-disable-line
   var pathMap = oldPathMap || Object.create(null);
   // $flow-disable-line
   var nameMap = oldNameMap || Object.create(null);
 
   routes.forEach(function (route) {
     addRouteRecord(pathList, pathMap, nameMap, route);
   });
 
   // ensure wildcard routes are always at the end
   for (var i = 0, l = pathList.length; i < l; i++) {
     if (pathList[i] === '*') {
       pathList.push(pathList.splice(i, 1)[0]);
       l--;
       i--;
     }
   }
 
   return {
     pathList: pathList,
     pathMap: pathMap,
     nameMap: nameMap
   }
 }
 
 function addRouteRecord (
   pathList,
   pathMap,
   nameMap,
   route,
   parent,
   matchAs
 ) {
   var path = route.path;
   var name = route.name;
   if (process.env.NODE_ENV !== 'production') {
     assert(path != null, "\"path\" is required in a route configuration.");
     assert(
       typeof route.component !== 'string',
       "route config \"component\" for path: " + (String(path || name)) + " cannot be a " +
       "string id. Use an actual component instead."
     );
   }
 
   var pathToRegexpOptions = route.pathToRegexpOptions || {};
   var normalizedPath = normalizePath(
     path,
     parent,
     pathToRegexpOptions.strict
   );
 
   if (typeof route.caseSensitive === 'boolean') {
     pathToRegexpOptions.sensitive = route.caseSensitive;
   }
 
   var record = {
     path: normalizedPath,
     regex: compileRouteRegex(normalizedPath, pathToRegexpOptions),
     components: route.components || { default: route.component },
     instances: {},
     name: name,
     parent: parent,
     matchAs: matchAs,
     redirect: route.redirect,
     beforeEnter: route.beforeEnter,
     meta: route.meta || {},
     props: route.props == null
       ? {}
       : route.components
         ? route.props
         : { default: route.props }
   };
 
   if (route.children) {
     // Warn if route is named, does not redirect and has a default child route.
     // If users navigate to this route by name, the default child will
     // not be rendered (GH Issue #629)
     if (process.env.NODE_ENV !== 'production') {
       if (route.name && !route.redirect && route.children.some(function (child) { return /^\/?$/.test(child.path); })) {
         warn(
           false,
           "Named Route '" + (route.name) + "' has a default child route. " +
           "When navigating to this named route (:to=\"{name: '" + (route.name) + "'\"), " +
           "the default child route will not be rendered. Remove the name from " +
           "this route and use the name of the default child route for named " +
           "links instead."
         );
       }
     }
     route.children.forEach(function (child) {
       var childMatchAs = matchAs
         ? cleanPath((matchAs + "/" + (child.path)))
         : undefined;
       addRouteRecord(pathList, pathMap, nameMap, child, record, childMatchAs);
     });
   }
 
   if (route.alias !== undefined) {
     var aliases = Array.isArray(route.alias)
       ? route.alias
       : [route.alias];
 
     aliases.forEach(function (alias) {
       var aliasRoute = {
         path: alias,
         children: route.children
       };
       addRouteRecord(
         pathList,
         pathMap,
         nameMap,
         aliasRoute,
         parent,
         record.path || '/' // matchAs
       );
     });
   }
 
   if (!pathMap[record.path]) {
     pathList.push(record.path);
     pathMap[record.path] = record;
   }
 
   if (name) {
     if (!nameMap[name]) {
       nameMap[name] = record;
     } else if (process.env.NODE_ENV !== 'production' && !matchAs) {
       warn(
         false,
         "Duplicate named routes definition: " +
         "{ name: \"" + name + "\", path: \"" + (record.path) + "\" }"
       );
     }
   }
 }
 
 function compileRouteRegex (path, pathToRegexpOptions) {
   var regex = pathToRegexp_1(path, [], pathToRegexpOptions);
   if (process.env.NODE_ENV !== 'production') {
     var keys = Object.create(null);
     regex.keys.forEach(function (key) {
       warn(!keys[key.name], ("Duplicate param keys in route with path: \"" + path + "\""));
       keys[key.name] = true;
     });
   }
   return regex
 }
 
 function normalizePath (path, parent, strict) {
   if (!strict) { path = path.replace(/\/$/, ''); }
   if (path[0] === '/') { return path }
   if (parent == null) { return path }
   return cleanPath(((parent.path) + "/" + path))
 }
 
 /*  */
 
 function normalizeLocation (
   raw,
   current,
   append,
   router
 ) {
   var next = typeof raw === 'string' ? { path: raw } : raw;
   // named target
   if (next.name || next._normalized) {
     return next
   }
 
   // relative params
   if (!next.path && next.params && current) {
     next = extend({}, next);
     next._normalized = true;
     var params = extend(extend({}, current.params), next.params);
     if (current.name) {
       next.name = current.name;
       next.params = params;
     } else if (current.matched.length) {
       var rawPath = current.matched[current.matched.length - 1].path;
       next.path = fillParams(rawPath, params, ("path " + (current.path)));
     } else if (process.env.NODE_ENV !== 'production') {
       warn(false, "relative params navigation requires a current route.");
     }
     return next
   }
 
   var parsedPath = parsePath(next.path || '');
   var basePath = (current && current.path) || '/';
   var path = parsedPath.path
     ? resolvePath(parsedPath.path, basePath, append || next.append)
     : basePath;
 
   var query = resolveQuery(
     parsedPath.query,
     next.query,
     router && router.options.parseQuery
   );
 
   var hash = next.hash || parsedPath.hash;
   if (hash && hash.charAt(0) !== '#') {
     hash = "#" + hash;
   }
 
   return {
     _normalized: true,
     path: path,
     query: query,
     hash: hash
   }
 }
 
 /*  */
 
 
 
 function createMatcher (
   routes,
   router
 ) {
   var ref = createRouteMap(routes);
   var pathList = ref.pathList;
   var pathMap = ref.pathMap;
   var nameMap = ref.nameMap;
 
   function addRoutes (routes) {
     createRouteMap(routes, pathList, pathMap, nameMap);
   }
 
   function match (
     raw,
     currentRoute,
     redirectedFrom
   ) {
     var location = normalizeLocation(raw, currentRoute, false, router);
     var name = location.name;
 
     if (name) {
       var record = nameMap[name];
       if (process.env.NODE_ENV !== 'production') {
         warn(record, ("Route with name '" + name + "' does not exist"));
       }
       if (!record) { return _createRoute(null, location) }
       var paramNames = record.regex.keys
         .filter(function (key) { return !key.optional; })
         .map(function (key) { return key.name; });
 
       if (typeof location.params !== 'object') {
         location.params = {};
       }
 
       if (currentRoute && typeof currentRoute.params === 'object') {
         for (var key in currentRoute.params) {
           if (!(key in location.params) && paramNames.indexOf(key) > -1) {
             location.params[key] = currentRoute.params[key];
           }
         }
       }
 
       if (record) {
         location.path = fillParams(record.path, location.params, ("named route \"" + name + "\""));
         return _createRoute(record, location, redirectedFrom)
       }
     } else if (location.path) {
       location.params = {};
       for (var i = 0; i < pathList.length; i++) {
         var path = pathList[i];
         var record$1 = pathMap[path];
         if (matchRoute(record$1.regex, location.path, location.params)) {
           return _createRoute(record$1, location, redirectedFrom)
         }
       }
     }
     // no match
     return _createRoute(null, location)
   }
 
   function redirect (
     record,
     location
   ) {
     var originalRedirect = record.redirect;
     var redirect = typeof originalRedirect === 'function'
       ? originalRedirect(createRoute(record, location, null, router))
       : originalRedirect;
 
     if (typeof redirect === 'string') {
       redirect = { path: redirect };
     }
 
     if (!redirect || typeof redirect !== 'object') {
       if (process.env.NODE_ENV !== 'production') {
         warn(
           false, ("invalid redirect option: " + (JSON.stringify(redirect)))
         );
       }
       return _createRoute(null, location)
     }
 
     var re = redirect;
     var name = re.name;
     var path = re.path;
     var query = location.query;
     var hash = location.hash;
     var params = location.params;
     query = re.hasOwnProperty('query') ? re.query : query;
     hash = re.hasOwnProperty('hash') ? re.hash : hash;
     params = re.hasOwnProperty('params') ? re.params : params;
 
     if (name) {
       // resolved named direct
       var targetRecord = nameMap[name];
       if (process.env.NODE_ENV !== 'production') {
         assert(targetRecord, ("redirect failed: named route \"" + name + "\" not found."));
       }
       return match({
         _normalized: true,
         name: name,
         query: query,
         hash: hash,
         params: params
       }, undefined, location)
     } else if (path) {
       // 1. resolve relative redirect
       var rawPath = resolveRecordPath(path, record);
       // 2. resolve params
       var resolvedPath = fillParams(rawPath, params, ("redirect route with path \"" + rawPath + "\""));
       // 3. rematch with existing query and hash
       return match({
         _normalized: true,
         path: resolvedPath,
         query: query,
         hash: hash
       }, undefined, location)
     } else {
       if (process.env.NODE_ENV !== 'production') {
         warn(false, ("invalid redirect option: " + (JSON.stringify(redirect))));
       }
       return _createRoute(null, location)
     }
   }
 
   function alias (
     record,
     location,
     matchAs
   ) {
     var aliasedPath = fillParams(matchAs, location.params, ("aliased route with path \"" + matchAs + "\""));
     var aliasedMatch = match({
       _normalized: true,
       path: aliasedPath
     });
     if (aliasedMatch) {
       var matched = aliasedMatch.matched;
       var aliasedRecord = matched[matched.length - 1];
       location.params = aliasedMatch.params;
       return _createRoute(aliasedRecord, location)
     }
     return _createRoute(null, location)
   }
 
   function _createRoute (
     record,
     location,
     redirectedFrom
   ) {
     if (record && record.redirect) {
       return redirect(record, redirectedFrom || location)
     }
     if (record && record.matchAs) {
       return alias(record, location, record.matchAs)
     }
     return createRoute(record, location, redirectedFrom, router)
   }
 
   return {
     match: match,
     addRoutes: addRoutes
   }
 }
 
 function matchRoute (
   regex,
   path,
   params
 ) {
   var m = path.match(regex);
 
   if (!m) {
     return false
   } else if (!params) {
     return true
   }
 
   for (var i = 1, len = m.length; i < len; ++i) {
     var key = regex.keys[i - 1];
     var val = typeof m[i] === 'string' ? decodeURIComponent(m[i]) : m[i];
     if (key) {
       // Fix #1994: using * with props: true generates a param named 0
       params[key.name || 'pathMatch'] = val;
     }
   }
 
   return true
 }
 
 function resolveRecordPath (path, record) {
   return resolvePath(path, record.parent ? record.parent.path : '/', true)
 }
 
 /*  */
 
 var positionStore = Object.create(null);
 
 function setupScroll () {
   // Fix for #1585 for Firefox
   // Fix for #2195 Add optional third attribute to workaround a bug in safari https://bugs.webkit.org/show_bug.cgi?id=182678
   window.history.replaceState({ key: getStateKey() }, '', window.location.href.replace(window.location.origin, ''));
   window.addEventListener('popstate', function (e) {
     saveScrollPosition();
     if (e.state && e.state.key) {
       setStateKey(e.state.key);
     }
   });
 }
 
 function handleScroll (
   router,
   to,
   from,
   isPop
 ) {
   if (!router.app) {
     return
   }
 
   var behavior = router.options.scrollBehavior;
   if (!behavior) {
     return
   }
 
   if (process.env.NODE_ENV !== 'production') {
     assert(typeof behavior === 'function', "scrollBehavior must be a function");
   }
 
   // wait until re-render finishes before scrolling
   router.app.$nextTick(function () {
     var position = getScrollPosition();
     var shouldScroll = behavior.call(router, to, from, isPop ? position : null);
 
     if (!shouldScroll) {
       return
     }
 
     if (typeof shouldScroll.then === 'function') {
       shouldScroll.then(function (shouldScroll) {
         scrollToPosition((shouldScroll), position);
       }).catch(function (err) {
         if (process.env.NODE_ENV !== 'production') {
           assert(false, err.toString());
         }
       });
     } else {
       scrollToPosition(shouldScroll, position);
     }
   });
 }
 
 function saveScrollPosition () {
   var key = getStateKey();
   if (key) {
     positionStore[key] = {
       x: window.pageXOffset,
       y: window.pageYOffset
     };
   }
 }
 
 function getScrollPosition () {
   var key = getStateKey();
   if (key) {
     return positionStore[key]
   }
 }
 
 function getElementPosition (el, offset) {
   var docEl = document.documentElement;
   var docRect = docEl.getBoundingClientRect();
   var elRect = el.getBoundingClientRect();
   return {
     x: elRect.left - docRect.left - offset.x,
     y: elRect.top - docRect.top - offset.y
   }
 }
 
 function isValidPosition (obj) {
   return isNumber(obj.x) || isNumber(obj.y)
 }
 
 function normalizePosition (obj) {
   return {
     x: isNumber(obj.x) ? obj.x : window.pageXOffset,
     y: isNumber(obj.y) ? obj.y : window.pageYOffset
   }
 }
 
 function normalizeOffset (obj) {
   return {
     x: isNumber(obj.x) ? obj.x : 0,
     y: isNumber(obj.y) ? obj.y : 0
   }
 }
 
 function isNumber (v) {
   return typeof v === 'number'
 }
 
 function scrollToPosition (shouldScroll, position) {
   var isObject = typeof shouldScroll === 'object';
   if (isObject && typeof shouldScroll.selector === 'string') {
     var el = document.querySelector(shouldScroll.selector);
     if (el) {
       var offset = shouldScroll.offset && typeof shouldScroll.offset === 'object' ? shouldScroll.offset : {};
       offset = normalizeOffset(offset);
       position = getElementPosition(el, offset);
     } else if (isValidPosition(shouldScroll)) {
       position = normalizePosition(shouldScroll);
     }
   } else if (isObject && isValidPosition(shouldScroll)) {
     position = normalizePosition(shouldScroll);
   }
 
   if (position) {
     window.scrollTo(position.x, position.y);
   }
 }
 
 /*  */
 
 var supportsPushState = inBrowser && (function () {
   var ua = window.navigator.userAgent;
 
   if (
     (ua.indexOf('Android 2.') !== -1 || ua.indexOf('Android 4.0') !== -1) &&
     ua.indexOf('Mobile Safari') !== -1 &&
     ua.indexOf('Chrome') === -1 &&
     ua.indexOf('Windows Phone') === -1
   ) {
     return false
   }
 
   return window.history && 'pushState' in window.history
 })();
 
 // use User Timing api (if present) for more accurate key precision
 var Time = inBrowser && window.performance && window.performance.now
   ? window.performance
   : Date;
 
 var _key = genKey();
 
 function genKey () {
   return Time.now().toFixed(3)
 }
 
 function getStateKey () {
   return _key
 }
 
 function setStateKey (key) {
   _key = key;
 }
 
 function pushState (url, replace) {
   saveScrollPosition();
   // try...catch the pushState call to get around Safari
   // DOM Exception 18 where it limits to 100 pushState calls
   var history = window.history;
   try {
     if (replace) {
       history.replaceState({ key: _key }, '', url);
     } else {
       _key = genKey();
       history.pushState({ key: _key }, '', url);
     }
   } catch (e) {
     window.location[replace ? 'replace' : 'assign'](url);
   }
 }
 
 function replaceState (url) {
   pushState(url, true);
 }
 
 /*  */
 
 function runQueue (queue, fn, cb) {
   var step = function (index) {
     if (index >= queue.length) {
       cb();
     } else {
       if (queue[index]) {
         fn(queue[index], function () {
           step(index + 1);
         });
       } else {
         step(index + 1);
       }
     }
   };
   step(0);
 }
 
 /*  */
 
 function resolveAsyncComponents (matched) {
   return function (to, from, next) {
     var hasAsync = false;
     var pending = 0;
     var error = null;
 
     flatMapComponents(matched, function (def, _, match, key) {
       // if it's a function and doesn't have cid attached,
       // assume it's an async component resolve function.
       // we are not using Vue's default async resolving mechanism because
       // we want to halt the navigation until the incoming component has been
       // resolved.
       if (typeof def === 'function' && def.cid === undefined) {
         hasAsync = true;
         pending++;
 
         var resolve = once(function (resolvedDef) {
           if (isESModule(resolvedDef)) {
             resolvedDef = resolvedDef.default;
           }
           // save resolved on async factory in case it's used elsewhere
           def.resolved = typeof resolvedDef === 'function'
             ? resolvedDef
             : _Vue.extend(resolvedDef);
           match.components[key] = resolvedDef;
           pending--;
           if (pending <= 0) {
             next();
           }
         });
 
         var reject = once(function (reason) {
           var msg = "Failed to resolve async component " + key + ": " + reason;
           process.env.NODE_ENV !== 'production' && warn(false, msg);
           if (!error) {
             error = isError(reason)
               ? reason
               : new Error(msg);
             next(error);
           }
         });
 
         var res;
         try {
           res = def(resolve, reject);
         } catch (e) {
           reject(e);
         }
         if (res) {
           if (typeof res.then === 'function') {
             res.then(resolve, reject);
           } else {
             // new syntax in Vue 2.3
             var comp = res.component;
             if (comp && typeof comp.then === 'function') {
               comp.then(resolve, reject);
             }
           }
         }
       }
     });
 
     if (!hasAsync) { next(); }
   }
 }
 
 function flatMapComponents (
   matched,
   fn
 ) {
   return flatten(matched.map(function (m) {
     return Object.keys(m.components).map(function (key) { return fn(
       m.components[key],
       m.instances[key],
       m, key
     ); })
   }))
 }
 
 function flatten (arr) {
   return Array.prototype.concat.apply([], arr)
 }
 
 var hasSymbol =
   typeof Symbol === 'function' &&
   typeof Symbol.toStringTag === 'symbol';
 
 function isESModule (obj) {
   return obj.__esModule || (hasSymbol && obj[Symbol.toStringTag] === 'Module')
 }
 
 // in Webpack 2, require.ensure now also returns a Promise
 // so the resolve/reject functions may get called an extra time
 // if the user uses an arrow function shorthand that happens to
 // return that Promise.
 function once (fn) {
   var called = false;
   return function () {
     var args = [], len = arguments.length;
     while ( len-- ) args[ len ] = arguments[ len ];
 
     if (called) { return }
     called = true;
     return fn.apply(this, args)
   }
 }
 
 /*  */
 
 var History = function History (router, base) {
   this.router = router;
   this.base = normalizeBase(base);
   // start with a route object that stands for "nowhere"
   this.current = START;
   this.pending = null;
   this.ready = false;
   this.readyCbs = [];
   this.readyErrorCbs = [];
   this.errorCbs = [];
 };
 
 History.prototype.listen = function listen (cb) {
   this.cb = cb;
 };
 
 History.prototype.onReady = function onReady (cb, errorCb) {
   if (this.ready) {
     cb();
   } else {
     this.readyCbs.push(cb);
     if (errorCb) {
       this.readyErrorCbs.push(errorCb);
     }
   }
 };
 
 History.prototype.onError = function onError (errorCb) {
   this.errorCbs.push(errorCb);
 };
 
 History.prototype.transitionTo = function transitionTo (location, onComplete, onAbort) {
     var this$1 = this;
 
   var route = this.router.match(location, this.current);
   this.confirmTransition(route, function () {
     this$1.updateRoute(route);
     onComplete && onComplete(route);
     this$1.ensureURL();
 
     // fire ready cbs once
     if (!this$1.ready) {
       this$1.ready = true;
       this$1.readyCbs.forEach(function (cb) { cb(route); });
     }
   }, function (err) {
     if (onAbort) {
       onAbort(err);
     }
     if (err && !this$1.ready) {
       this$1.ready = true;
       this$1.readyErrorCbs.forEach(function (cb) { cb(err); });
     }
   });
 };
 
 History.prototype.confirmTransition = function confirmTransition (route, onComplete, onAbort) {
     var this$1 = this;
 
   var current = this.current;
   var abort = function (err) {
     if (isError(err)) {
       if (this$1.errorCbs.length) {
         this$1.errorCbs.forEach(function (cb) { cb(err); });
       } else {
         warn(false, 'uncaught error during route navigation:');
         console.error(err);
       }
     }
     onAbort && onAbort(err);
   };
   if (
     isSameRoute(route, current) &&
     // in the case the route map has been dynamically appended to
     route.matched.length === current.matched.length
   ) {
     this.ensureURL();
     return abort()
   }
 
   var ref = resolveQueue(this.current.matched, route.matched);
     var updated = ref.updated;
     var deactivated = ref.deactivated;
     var activated = ref.activated;
 
   var queue = [].concat(
     // in-component leave guards
     extractLeaveGuards(deactivated),
     // global before hooks
     this.router.beforeHooks,
     // in-component update hooks
     extractUpdateHooks(updated),
     // in-config enter guards
     activated.map(function (m) { return m.beforeEnter; }),
     // async components
     resolveAsyncComponents(activated)
   );
 
   this.pending = route;
   var iterator = function (hook, next) {
     if (this$1.pending !== route) {
       return abort()
     }
     try {
       hook(route, current, function (to) {
         if (to === false || isError(to)) {
           // next(false) -> abort navigation, ensure current URL
           this$1.ensureURL(true);
           abort(to);
         } else if (
           typeof to === 'string' ||
           (typeof to === 'object' && (
             typeof to.path === 'string' ||
             typeof to.name === 'string'
           ))
         ) {
           // next('/') or next({ path: '/' }) -> redirect
           abort();
           if (typeof to === 'object' && to.replace) {
             this$1.replace(to);
           } else {
             this$1.push(to);
           }
         } else {
           // confirm transition and pass on the value
           next(to);
         }
       });
     } catch (e) {
       abort(e);
     }
   };
 
   runQueue(queue, iterator, function () {
     var postEnterCbs = [];
     var isValid = function () { return this$1.current === route; };
     // wait until async components are resolved before
     // extracting in-component enter guards
     var enterGuards = extractEnterGuards(activated, postEnterCbs, isValid);
     var queue = enterGuards.concat(this$1.router.resolveHooks);
     runQueue(queue, iterator, function () {
       if (this$1.pending !== route) {
         return abort()
       }
       this$1.pending = null;
       onComplete(route);
       if (this$1.router.app) {
         this$1.router.app.$nextTick(function () {
           postEnterCbs.forEach(function (cb) { cb(); });
         });
       }
     });
   });
 };
 
 History.prototype.updateRoute = function updateRoute (route) {
   var prev = this.current;
   this.current = route;
   this.cb && this.cb(route);
   this.router.afterHooks.forEach(function (hook) {
     hook && hook(route, prev);
   });
 };
 
 function normalizeBase (base) {
   if (!base) {
     if (inBrowser) {
       // respect <base> tag
       var baseEl = document.querySelector('base');
       base = (baseEl && baseEl.getAttribute('href')) || '/';
       // strip full URL origin
       base = base.replace(/^https?:\/\/[^\/]+/, '');
     } else {
       base = '/';
     }
   }
   // make sure there's the starting slash
   if (base.charAt(0) !== '/') {
     base = '/' + base;
   }
   // remove trailing slash
   return base.replace(/\/$/, '')
 }
 
 function resolveQueue (
   current,
   next
 ) {
   var i;
   var max = Math.max(current.length, next.length);
   for (i = 0; i < max; i++) {
     if (current[i] !== next[i]) {
       break
     }
   }
   return {
     updated: next.slice(0, i),
     activated: next.slice(i),
     deactivated: current.slice(i)
   }
 }
 
 function extractGuards (
   records,
   name,
   bind,
   reverse
 ) {
   var guards = flatMapComponents(records, function (def, instance, match, key) {
     var guard = extractGuard(def, name);
     if (guard) {
       return Array.isArray(guard)
         ? guard.map(function (guard) { return bind(guard, instance, match, key); })
         : bind(guard, instance, match, key)
     }
   });
   return flatten(reverse ? guards.reverse() : guards)
 }
 
 function extractGuard (
   def,
   key
 ) {
   if (typeof def !== 'function') {
     // extend now so that global mixins are applied.
     def = _Vue.extend(def);
   }
   return def.options[key]
 }
 
 function extractLeaveGuards (deactivated) {
   return extractGuards(deactivated, 'beforeRouteLeave', bindGuard, true)
 }
 
 function extractUpdateHooks (updated) {
   return extractGuards(updated, 'beforeRouteUpdate', bindGuard)
 }
 
 function bindGuard (guard, instance) {
   if (instance) {
     return function boundRouteGuard () {
       return guard.apply(instance, arguments)
     }
   }
 }
 
 function extractEnterGuards (
   activated,
   cbs,
   isValid
 ) {
   return extractGuards(activated, 'beforeRouteEnter', function (guard, _, match, key) {
     return bindEnterGuard(guard, match, key, cbs, isValid)
   })
 }
 
 function bindEnterGuard (
   guard,
   match,
   key,
   cbs,
   isValid
 ) {
   return function routeEnterGuard (to, from, next) {
     return guard(to, from, function (cb) {
       next(cb);
       if (typeof cb === 'function') {
         cbs.push(function () {
           // #750
           // if a router-view is wrapped with an out-in transition,
           // the instance may not have been registered at this time.
           // we will need to poll for registration until current route
           // is no longer valid.
           poll(cb, match.instances, key, isValid);
         });
       }
     })
   }
 }
 
 function poll (
   cb, // somehow flow cannot infer this is a function
   instances,
   key,
   isValid
 ) {
   if (
     instances[key] &&
     !instances[key]._isBeingDestroyed // do not reuse being destroyed instance
   ) {
     cb(instances[key]);
   } else if (isValid()) {
     setTimeout(function () {
       poll(cb, instances, key, isValid);
     }, 16);
   }
 }
 
 /*  */
 
 var HTML5History = (function (History$$1) {
   function HTML5History (router, base) {
     var this$1 = this;
 
     History$$1.call(this, router, base);
 
     var expectScroll = router.options.scrollBehavior;
     var supportsScroll = supportsPushState && expectScroll;
 
     if (supportsScroll) {
       setupScroll();
     }
 
     var initLocation = getLocation(this.base);
     window.addEventListener('popstate', function (e) {
       var current = this$1.current;
 
       // Avoiding first `popstate` event dispatched in some browsers but first
       // history route not updated since async guard at the same time.
       var location = getLocation(this$1.base);
       if (this$1.current === START && location === initLocation) {
         return
       }
 
       this$1.transitionTo(location, function (route) {
         if (supportsScroll) {
           handleScroll(router, route, current, true);
         }
       });
     });
   }
 
   if ( History$$1 ) HTML5History.__proto__ = History$$1;
   HTML5History.prototype = Object.create( History$$1 && History$$1.prototype );
   HTML5History.prototype.constructor = HTML5History;
 
   HTML5History.prototype.go = function go (n) {
     window.history.go(n);
   };
 
   HTML5History.prototype.push = function push (location, onComplete, onAbort) {
     var this$1 = this;
 
     var ref = this;
     var fromRoute = ref.current;
     this.transitionTo(location, function (route) {
       pushState(cleanPath(this$1.base + route.fullPath));
       handleScroll(this$1.router, route, fromRoute, false);
       onComplete && onComplete(route);
     }, onAbort);
   };
 
   HTML5History.prototype.replace = function replace (location, onComplete, onAbort) {
     var this$1 = this;
 
     var ref = this;
     var fromRoute = ref.current;
     this.transitionTo(location, function (route) {
       replaceState(cleanPath(this$1.base + route.fullPath));
       handleScroll(this$1.router, route, fromRoute, false);
       onComplete && onComplete(route);
     }, onAbort);
   };
 
   HTML5History.prototype.ensureURL = function ensureURL (push) {
     if (getLocation(this.base) !== this.current.fullPath) {
       var current = cleanPath(this.base + this.current.fullPath);
       push ? pushState(current) : replaceState(current);
     }
   };
 
   HTML5History.prototype.getCurrentLocation = function getCurrentLocation () {
     return getLocation(this.base)
   };
 
   return HTML5History;
 }(History));
 
 function getLocation (base) {
   var path = decodeURI(window.location.pathname);
   if (base && path.indexOf(base) === 0) {
     path = path.slice(base.length);
   }
   return (path || '/') + window.location.search + window.location.hash
 }
 
 /*  */
 
 var HashHistory = (function (History$$1) {
   function HashHistory (router, base, fallback) {
     History$$1.call(this, router, base);
     // check history fallback deeplinking
     if (fallback && checkFallback(this.base)) {
       return
     }
     ensureSlash();
   }
 
   if ( History$$1 ) HashHistory.__proto__ = History$$1;
   HashHistory.prototype = Object.create( History$$1 && History$$1.prototype );
   HashHistory.prototype.constructor = HashHistory;
 
   // this is delayed until the app mounts
   // to avoid the hashchange listener being fired too early
   HashHistory.prototype.setupListeners = function setupListeners () {
     var this$1 = this;
 
     var router = this.router;
     var expectScroll = router.options.scrollBehavior;
     var supportsScroll = supportsPushState && expectScroll;
 
     if (supportsScroll) {
       setupScroll();
     }
 
     window.addEventListener(supportsPushState ? 'popstate' : 'hashchange', function () {
       var current = this$1.current;
       if (!ensureSlash()) {
         return
       }
       this$1.transitionTo(getHash(), function (route) {
         if (supportsScroll) {
           handleScroll(this$1.router, route, current, true);
         }
         if (!supportsPushState) {
           replaceHash(route.fullPath);
         }
       });
     });
   };
 
   HashHistory.prototype.push = function push (location, onComplete, onAbort) {
     var this$1 = this;
 
     var ref = this;
     var fromRoute = ref.current;
     this.transitionTo(location, function (route) {
       pushHash(route.fullPath);
       handleScroll(this$1.router, route, fromRoute, false);
       onComplete && onComplete(route);
     }, onAbort);
   };
 
   HashHistory.prototype.replace = function replace (location, onComplete, onAbort) {
     var this$1 = this;
 
     var ref = this;
     var fromRoute = ref.current;
     this.transitionTo(location, function (route) {
       replaceHash(route.fullPath);
       handleScroll(this$1.router, route, fromRoute, false);
       onComplete && onComplete(route);
     }, onAbort);
   };
 
   HashHistory.prototype.go = function go (n) {
     window.history.go(n);
   };
 
   HashHistory.prototype.ensureURL = function ensureURL (push) {
     var current = this.current.fullPath;
     if (getHash() !== current) {
       push ? pushHash(current) : replaceHash(current);
     }
   };
 
   HashHistory.prototype.getCurrentLocation = function getCurrentLocation () {
     return getHash()
   };
 
   return HashHistory;
 }(History));
 
 function checkFallback (base) {
   var location = getLocation(base);
   if (!/^\/#/.test(location)) {
     window.location.replace(
       cleanPath(base + '/#' + location)
     );
     return true
   }
 }
 
 function ensureSlash () {
   var path = getHash();
   if (path.charAt(0) === '/') {
     return true
   }
   replaceHash('/' + path);
   return false
 }
 
 function getHash () {
   // We can't use window.location.hash here because it's not
   // consistent across browsers - Firefox will pre-decode it!
   var href = window.location.href;
   var index = href.indexOf('#');
   return index === -1 ? '' : decodeURI(href.slice(index + 1))
 }
 
 function getUrl (path) {
   var href = window.location.href;
   var i = href.indexOf('#');
   var base = i >= 0 ? href.slice(0, i) : href;
   return (base + "#" + path)
 }
 
 function pushHash (path) {
   if (supportsPushState) {
     pushState(getUrl(path));
   } else {
     window.location.hash = path;
   }
 }
 
 function replaceHash (path) {
   if (supportsPushState) {
     replaceState(getUrl(path));
   } else {
     window.location.replace(getUrl(path));
   }
 }
 
 /*  */
 
 var AbstractHistory = (function (History$$1) {
   function AbstractHistory (router, base) {
     History$$1.call(this, router, base);
     this.stack = [];
     this.index = -1;
   }
 
   if ( History$$1 ) AbstractHistory.__proto__ = History$$1;
   AbstractHistory.prototype = Object.create( History$$1 && History$$1.prototype );
   AbstractHistory.prototype.constructor = AbstractHistory;
 
   AbstractHistory.prototype.push = function push (location, onComplete, onAbort) {
     var this$1 = this;
 
     this.transitionTo(location, function (route) {
       this$1.stack = this$1.stack.slice(0, this$1.index + 1).concat(route);
       this$1.index++;
       onComplete && onComplete(route);
     }, onAbort);
   };
 
   AbstractHistory.prototype.replace = function replace (location, onComplete, onAbort) {
     var this$1 = this;
 
     this.transitionTo(location, function (route) {
       this$1.stack = this$1.stack.slice(0, this$1.index).concat(route);
       onComplete && onComplete(route);
     }, onAbort);
   };
 
   AbstractHistory.prototype.go = function go (n) {
     var this$1 = this;
 
     var targetIndex = this.index + n;
     if (targetIndex < 0 || targetIndex >= this.stack.length) {
       return
     }
     var route = this.stack[targetIndex];
     this.confirmTransition(route, function () {
       this$1.index = targetIndex;
       this$1.updateRoute(route);
     });
   };
 
   AbstractHistory.prototype.getCurrentLocation = function getCurrentLocation () {
     var current = this.stack[this.stack.length - 1];
     return current ? current.fullPath : '/'
   };
 
   AbstractHistory.prototype.ensureURL = function ensureURL () {
     // noop
   };
 
   return AbstractHistory;
 }(History));
 
 /*  */
 
 
 
 var VueRouter = function VueRouter (options) {
   if ( options === void 0 ) options = {};
 
   this.app = null;
   this.apps = [];
   this.options = options;
   this.beforeHooks = [];
   this.resolveHooks = [];
   this.afterHooks = [];
   this.matcher = createMatcher(options.routes || [], this);
 
   var mode = options.mode || 'hash';
   this.fallback = mode === 'history' && !supportsPushState && options.fallback !== false;
   if (this.fallback) {
     mode = 'hash';
   }
   if (!inBrowser) {
     mode = 'abstract';
   }
   this.mode = mode;
 
   switch (mode) {
     case 'history':
       this.history = new HTML5History(this, options.base);
       break
     case 'hash':
       this.history = new HashHistory(this, options.base, this.fallback);
       break
     case 'abstract':
       this.history = new AbstractHistory(this, options.base);
       break
     default:
       if (process.env.NODE_ENV !== 'production') {
         assert(false, ("invalid mode: " + mode));
       }
   }
 };
 
 var prototypeAccessors = { currentRoute: { configurable: true } };
 
 VueRouter.prototype.match = function match (
   raw,
   current,
   redirectedFrom
 ) {
   return this.matcher.match(raw, current, redirectedFrom)
 };
 
 prototypeAccessors.currentRoute.get = function () {
   return this.history && this.history.current
 };
 
 VueRouter.prototype.init = function init (app /* Vue component instance */) {
     var this$1 = this;
 
   process.env.NODE_ENV !== 'production' && assert(
     install.installed,
     "not installed. Make sure to call `Vue.use(VueRouter)` " +
     "before creating root instance."
   );
 
   this.apps.push(app);
 
   // main app already initialized.
   if (this.app) {
     return
   }
 
   this.app = app;
 
   var history = this.history;
 
   if (history instanceof HTML5History) {
     history.transitionTo(history.getCurrentLocation());
   } else if (history instanceof HashHistory) {
     var setupHashListener = function () {
       history.setupListeners();
     };
     history.transitionTo(
       history.getCurrentLocation(),
       setupHashListener,
       setupHashListener
     );
   }
 
   history.listen(function (route) {
     this$1.apps.forEach(function (app) {
       app._route = route;
     });
   });
 };
 
 VueRouter.prototype.beforeEach = function beforeEach (fn) {
   return registerHook(this.beforeHooks, fn)
 };
 
 VueRouter.prototype.beforeResolve = function beforeResolve (fn) {
   return registerHook(this.resolveHooks, fn)
 };
 
 VueRouter.prototype.afterEach = function afterEach (fn) {
   return registerHook(this.afterHooks, fn)
 };
 
 VueRouter.prototype.onReady = function onReady (cb, errorCb) {
   this.history.onReady(cb, errorCb);
 };
 
 VueRouter.prototype.onError = function onError (errorCb) {
   this.history.onError(errorCb);
 };
 
 VueRouter.prototype.push = function push (location, onComplete, onAbort) {
   this.history.push(location, onComplete, onAbort);
 };
 
 VueRouter.prototype.replace = function replace (location, onComplete, onAbort) {
   this.history.replace(location, onComplete, onAbort);
 };
 
 VueRouter.prototype.go = function go (n) {
   this.history.go(n);
 };
 
 VueRouter.prototype.back = function back () {
   this.go(-1);
 };
 
 VueRouter.prototype.forward = function forward () {
   this.go(1);
 };
 
 VueRouter.prototype.getMatchedComponents = function getMatchedComponents (to) {
   var route = to
     ? to.matched
       ? to
       : this.resolve(to).route
     : this.currentRoute;
   if (!route) {
     return []
   }
   return [].concat.apply([], route.matched.map(function (m) {
     return Object.keys(m.components).map(function (key) {
       return m.components[key]
     })
   }))
 };
 
 VueRouter.prototype.resolve = function resolve (
   to,
   current,
   append
 ) {
   var location = normalizeLocation(
     to,
     current || this.history.current,
     append,
     this
   );
   var route = this.match(location, current);
   var fullPath = route.redirectedFrom || route.fullPath;
   var base = this.history.base;
   var href = createHref(base, fullPath, this.mode);
   return {
     location: location,
     route: route,
     href: href,
     // for backwards compat
     normalizedTo: location,
     resolved: route
   }
 };
 
 VueRouter.prototype.addRoutes = function addRoutes (routes) {
   this.matcher.addRoutes(routes);
   if (this.history.current !== START) {
     this.history.transitionTo(this.history.getCurrentLocation());
   }
 };
 
 Object.defineProperties( VueRouter.prototype, prototypeAccessors );
 
 function registerHook (list, fn) {
   list.push(fn);
   return function () {
     var i = list.indexOf(fn);
     if (i > -1) { list.splice(i, 1); }
   }
 }
 
 function createHref (base, fullPath, mode) {
   var path = mode === 'hash' ? '#' + fullPath : fullPath;
   return base ? cleanPath(base + '/' + path) : path
 }
 
 VueRouter.install = install;
 VueRouter.version = '3.0.2';
 
 if (inBrowser && window.Vue) {
   window.Vue.use(VueRouter);
 }
 
 module.exports = VueRouter;
 